The girl's twin was treated for burns after being found in his adoptive father's truck

(CNN) -- The adoptive mother of a Florida girl found dead in a plastic bag in her husband's truck has been charged with first-degree murder, police said Saturday.

Carmen Barahona also faces seven counts of aggravated child abuse and seven counts of child neglect, the Miami-Dade Police Department said in a press release.

Authorities have said Jorge Barahona -- the 10-year-old girl's adoptive father and Carmen's husband -- parked his pest control truck alongside I-95 on February 14. A roadside ranger said he found Barahona beside the truck and his adopted son ill inside the vehicle, which was filled with toxic chemicals. The boy was taken to a hospital to be treated for severe burns.

The body of his adopted daughter, Nubia -- who is the boy's twin sister -- was later discovered in the back of the truck in a plastic bag.

Four days later, Jorge Barahona pleaded not guilty on charges of attempted first-degree murder with a weapon and aggravated child abuse with a weapon in the case.

At least two people tried to warn authorities about alleged abuse of the twins.

In one instance, a caller told Florida authorities that he knew Jorge and Carmen Barahona, and he was worried about the couple's twins. The contents of that phone call, which was made two days before the twins were found, was released this week by the Florida Department of Children and Families.